[PATCH 12/28] ibtrs_srv: add sysfs interface

[Jack Wang <jinpu.wang@profitbricks.com>]

From: Jack Wang <jinpu.wang@profitbricks.com>

Signed-off-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: Kleber Souza <kleber.souza@profitbricks.com>
Signed-off-by: Danil Kipnis <danil.kipnis@profitbricks.com>
Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
---
 .../infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.c  | 301 +++++++++++++++++++++
 .../infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.h  |  59 ++++
 2 files changed, 360 insertions(+)
 create mode 100644 drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.c
 create mode 100644 drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.h

diff --git a/drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.c b/drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.c
new file mode 100644
index 0000000..c95a124
--- /dev/null
+++ b/drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.c
@@ -0,0 +1,301 @@
+/*
+ * InfiniBand Transport Layer
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler < mail@fholler.de>
+ *          Jack Wang <jinpu.wang@profitbricks.com>
+ *   	    Kleber Souza <kleber.souza@profitbricks.com>
+ * 	    Danil Kipnis <danil.kipnis@profitbricks.com>
+ *   	    Roman Pen <roman.penyaev@profitbricks.com>
+ *          Milind Dumbare <Milind.dumbare@gmail.com>
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ */
+
+#include "ibtrs_srv_sysfs.h"
+#include "ibtrs_srv_internal.h"
+#include <rdma/ibtrs_srv.h>
+#include <rdma/ibtrs.h>
+#include <rdma/ibtrs_log.h>
+
+static struct kobject *ibtrs_srv_kobj;
+static struct kobject *ibtrs_srv_sessions_kobj;
+
+static ssize_t ibtrs_srv_hb_timeout_show(struct kobject *kobj,
+					 struct kobj_attribute *attr,
+					 char *page)
+{
+	struct ibtrs_session *sess = container_of(kobj, struct ibtrs_session,
+						  kobj);
+
+	return scnprintf(page, PAGE_SIZE, "%u\n", sess->heartbeat.timeout_ms);
+}
+
+static ssize_t ibtrs_srv_hb_timeout_store(struct kobject *kobj,
+					  struct kobj_attribute *attr,
+					  const char *buf, size_t count)
+{
+	int ret;
+	u32 timeout_ms;
+	struct ibtrs_session *sess = container_of(kobj, struct ibtrs_session,
+						  kobj);
+
+	ret = kstrtouint(buf, 0, &timeout_ms);
+	if (ret)
+		return ret;
+
+	ret = ibtrs_heartbeat_timeout_validate(timeout_ms);
+	if (ret)
+		return ret;
+
+	INFO(sess, "%s: changing value from %u to %u\n", attr->attr.name,
+	     sess->heartbeat.timeout_ms, timeout_ms);
+	ibtrs_set_heartbeat_timeout(&sess->heartbeat, timeout_ms);
+	return count;
+}
+
+static struct kobj_attribute ibtrs_srv_heartbeat_timeout_ms_attr =
+	__ATTR(heartbeat_timeout_ms, 0644,
+	       ibtrs_srv_hb_timeout_show, ibtrs_srv_hb_timeout_store);
+
+static ssize_t ibtrs_srv_disconnect_show(struct kobject *kobj,
+					 struct kobj_attribute *attr,
+					 char *page)
+{
+	return scnprintf(page, PAGE_SIZE, "Usage: echo 1 > %s\n",
+			 attr->attr.name);
+}
+
+static ssize_t ibtrs_srv_disconnect_store(struct kobject *kobj,
+					  struct kobj_attribute *attr,
+					  const char *buf, size_t count)
+{
+	struct ibtrs_session *sess = container_of(kobj, struct ibtrs_session,
+						  kobj);
+
+	if (!sysfs_streq(buf, "1")) {
+		ERR(sess, "%s: invalid value: '%s'\n", attr->attr.name, buf);
+		return -EINVAL;
+	}
+
+	INFO(sess, "%s: Session disconnect requested\n", attr->attr.name);
+	ibtrs_srv_queue_close(sess);
+
+	return count;
+}
+
+static struct kobj_attribute disconnect_attr =
+	__ATTR(disconnect, 0644,
+	       ibtrs_srv_disconnect_show, ibtrs_srv_disconnect_store);
+
+static ssize_t ibtrs_srv_current_hca_port_show(struct kobject *kobj,
+					       struct kobj_attribute *attr,
+					       char *page)
+{
+	struct ibtrs_session *sess = container_of(kobj, struct ibtrs_session,
+						  kobj);
+	return ibtrs_srv_current_hca_port_to_str(sess, page, PAGE_SIZE);
+}
+
+static struct kobj_attribute current_hca_port_attr =
+	__ATTR(current_hca_port, 0444, ibtrs_srv_current_hca_port_show,
+	       NULL);
+
+static ssize_t ibtrs_srv_hca_name_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *page)
+{
+	struct ibtrs_session *sess = container_of(kobj, struct ibtrs_session,
+						  kobj);
+
+	return scnprintf(page, PAGE_SIZE, "%s\n",
+			 ibtrs_srv_get_sess_hca_name(sess));
+}
+
+static struct kobj_attribute hca_name_attr =
+	__ATTR(hca_name, 0444, ibtrs_srv_hca_name_show, NULL);
+
+static ssize_t hostname_show(struct kobject *kobj,
+			     struct kobj_attribute *attr, char *page)
+{
+	struct ibtrs_session *sess = container_of(kobj, struct ibtrs_session,
+						  kobj);
+	return sprintf(page, "%s\n", sess->hostname);
+}
+
+static struct kobj_attribute hostname_attr =
+		__ATTR(hostname, 0444, hostname_show, NULL);
+
+static struct attribute *default_sess_attrs[] = {
+	&hca_name_attr.attr,
+	&hostname_attr.attr,
+	&current_hca_port_attr.attr,
+	&disconnect_attr.attr,
+	&ibtrs_srv_heartbeat_timeout_ms_attr.attr,
+	NULL,
+};
+
+static struct attribute_group default_sess_attr_group = {
+	.attrs = default_sess_attrs,
+};
+
+static void ibtrs_srv_sess_release(struct kobject *kobj)
+{
+	struct ibtrs_session *sess = container_of(kobj, struct ibtrs_session,
+						  kobj);
+
+	ibtrs_srv_sess_put(sess);
+}
+
+static struct kobj_type ibtrs_srv_sess_ktype = {
+	.sysfs_ops	= &kobj_sysfs_ops,
+	.release	= ibtrs_srv_sess_release,
+};
+
+STAT_ATTR(rdma, ibtrs_srv_stats_rdma_to_str, ibtrs_srv_reset_rdma_stats);
+
+STAT_ATTR(user_ib_messages, ibtrs_srv_stats_user_ib_msgs_to_str,
+	  ibtrs_srv_reset_user_ib_msgs_stats);
+
+STAT_ATTR(wc_completion, ibtrs_srv_stats_wc_completion_to_str,
+	  ibtrs_srv_reset_wc_completion_stats);
+
+STAT_ATTR(reset_all, ibtrs_srv_reset_all_help, ibtrs_srv_reset_all_stats);
+
+static struct attribute *ibtrs_srv_default_stats_attrs[] = {
+	&rdma_attr.attr,
+	&user_ib_messages_attr.attr,
+	&wc_completion_attr.attr,
+	&reset_all_attr.attr,
+	NULL,
+};
+
+static struct attribute_group ibtrs_srv_default_stats_attr_group = {
+	.attrs = ibtrs_srv_default_stats_attrs,
+};
+
+static struct kobj_type ibtrs_stats_ktype = {
+	.sysfs_ops = &kobj_sysfs_ops,
+};
+
+static int ibtrs_srv_create_stats_files(struct ibtrs_session *sess)
+{
+	int ret;
+
+	ret = kobject_init_and_add(&sess->kobj_stats, &ibtrs_stats_ktype,
+				   &sess->kobj, "stats");
+	if (ret) {
+		ERR(sess,
+		    "Failed to init and add sysfs directory for session stats,"
+		    " errno: %d\n", ret);
+		return ret;
+	}
+
+	ret = sysfs_create_group(&sess->kobj_stats,
+				 &ibtrs_srv_default_stats_attr_group);
+	if (ret) {
+		ERR(sess, "Failed to create sysfs group for session stats,"
+		    " errno: %d\n", ret);
+		goto err;
+	}
+
+	return 0;
+
+err:
+	kobject_put(&sess->kobj_stats);
+
+	return ret;
+}
+
+int ibtrs_srv_create_sess_files(struct ibtrs_session *sess)
+{
+	int ret;
+
+	DEB("creating sysfs files for sess %s\n", sess->addr);
+
+	if (WARN_ON(!ibtrs_srv_sess_get(sess)))
+		return -EINVAL;
+
+	ret = kobject_init_and_add(&sess->kobj, &ibtrs_srv_sess_ktype,
+				   ibtrs_srv_sessions_kobj, "%s", sess->addr);
+	if (ret) {
+		ERR(sess, "Failed to init and add sysfs directory for session,"
+		    " errno: %d\n", ret);
+		ibtrs_srv_sess_put(sess);
+		return ret;
+	}
+
+	ret = sysfs_create_group(&sess->kobj, &default_sess_attr_group);
+	if (ret) {
+		ERR(sess, "Failed to create sysfs group for session,"
+		    " errno: %d\n", ret);
+		goto err;
+	}
+
+	ret = ibtrs_srv_create_stats_files(sess);
+	if (ret)
+		goto err1;
+
+	return 0;
+
+err1:
+	sysfs_remove_group(&sess->kobj, &default_sess_attr_group);
+err:
+	kobject_put(&sess->kobj);
+
+	return ret;
+}
+
+int ibtrs_srv_create_sysfs_files(void)
+{
+	ibtrs_srv_kobj = kobject_create_and_add("ibtrs", kernel_kobj);
+	if (!ibtrs_srv_kobj)
+		return -ENOMEM;
+
+	ibtrs_srv_sessions_kobj = kobject_create_and_add("sessions",
+							 ibtrs_srv_kobj);
+	if (!ibtrs_srv_sessions_kobj) {
+		kobject_put(ibtrs_srv_kobj);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void ibtrs_srv_destroy_sysfs_files(void)
+{
+	kobject_put(ibtrs_srv_sessions_kobj);
+	kobject_put(ibtrs_srv_kobj);
+}
diff --git a/drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.h b/drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.h
new file mode 100644
index 0000000..e5dfa62
--- /dev/null
+++ b/drivers/infiniband/ulp/ibtrs_server/ibtrs_srv_sysfs.h
@@ -0,0 +1,59 @@
+/*
+ * InfiniBand Transport Layer
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler < mail@fholler.de>
+ *          Jack Wang <jinpu.wang@profitbricks.com>
+ *   	    Kleber Souza <kleber.souza@profitbricks.com>
+ * 	    Danil Kipnis <danil.kipnis@profitbricks.com>
+ *   	    Roman Pen <roman.penyaev@profitbricks.com>
+ *          Milind Dumbare <Milind.dumbare@gmail.com>
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ */
+
+#ifndef _IBTRS_SRV_SYFS_H
+#define _IBTRS_SRV_SYFS_H
+
+#include <linux/kobject.h>
+#include "ibtrs_srv_internal.h"
+
+int ibtrs_srv_create_sysfs_files(void);
+
+void ibtrs_srv_destroy_sysfs_files(void);
+
+int ibtrs_srv_create_sess_files(struct ibtrs_session *sess);
+
+#endif
-- 
2.7.4